Apparatus for preparing and feeding fuel.



, Patented Sept. 4, I900.

A, A. DAY.

(Application. filed May 2, 1900.)

[NVENTOR Affair/12y;

WITNESSES." r i zwzd. 9 /@2;m

UNiTEn STAT-Es PATENT OFFICE.

ALBERT A. DAY, on NEW YORK, N. Y.

APPARATUS FOR PREPARING AND FEEDING FUEL-L SPECIFICATION forming part of Letters Patent No. 657,398, dated September 4, 1900.

Application filed May 2, 1.900.

serial No. 15,263. (No model.)

clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertains to make and use the same. My present invention relates to apparatus for preparing and feeding fuel in finely-db.

vided conditions to furnaces, and, more particularly stated, is an improvement upon the construction shown,described,and illustrated in my prior Letters Patent, No. 634,552, of October 10, 1899; and it consists in certain novel features of construction and combina--' tion of parts whereby improved results and greater efficiency are obtained.

The best form in which I have'contem plated embodying my present invention is illustrated in the accompanying drawings, and my said invention is disclosed in the following description and claims.

My said invention relates more particularly to the construction of the pulverizing-cham-. her, the devices connected therewith, and the combination of such construction, whereby the operation of pulverizing the fuel is more economically and efficiently effected.

Figure 1 is a plan view of the apparatus or pulverizing-chamber with the upper portion removed, together with the parts connected thereto. Fig. 2 is a detail showing the ribbed surface of the interior of the pul verizer-casing.

In said figures of drawings, A designates the casing of the pulverizing-chamber. The main portion of the casing is in the form of a truncated cone disposed in a horizontal position, with the side walls of the casing tapering inward toward the outlet end'of the same, where the casing connects with an annular trough A. At the opposite endthe casing. is provided withacylindrical portion a, forming an extension of the walls of the casing. In other respects than those already and here inafter described my present pulverizingchamber is constructed in the general form and manner set forth in my earlier patent,

Ihereinbefore particularly referred to. It has connected with it a breaking and grinding mechanism B, similar to the breaking and grinding mechanism of my said patent, and this breaking and grinding mechanism is con- Inected with the pulveriz ing-chamber in substantially the same manner as the breaking and grinding mechanism of my said patent for the purpose of delivering the material or fuel to the pulverizer after it has been acted upon by the breaking and grinding mechanism.

C designates a horizontal shaft which passes centrally through the casing A, within which it is provided with fan or pulverizing blades 0. These blades, as, in my former patent, have their outer edges parallel to the conical wall of the casing, and said blades are set parallel to the shaft G or the axis of the conical casing. This said shaft is also provided within the cylindrical portion aof the casing with other fan-blades c, which are set at an angle to the said shaft in the manner indicated, so as to effect the feeding of the material forward toward the outlet end of the pulverizer and to prevent any "backward movement of the broken fuel delivered to the pulverizer from the breaking and grinding device.

Within the trough A of the casing the shaft 0 is provided with fan-blades 0 which act to produce a blast for ejecting the powdered material and delivering it to the furnace.

The inner surface of the casing A throughout its tapering and cylindrical portions is preferably provided with slight corrugations or a network of slightly-projecting ribs to hold and retard the unpulverized material, so as to enable the pulverizing-blades c c to act more efficiently upon the same. The projecting portions of this roughened surface rise above the main portion of the surface but a short distance, from. one-sixteenth of an inch upward, as may be found most dosirable. In this case I have shown each of the pulverizer-blades attached to a short arm or rod, which is secured in a socket on the main blade-arm by a set-screw 0 so that the blades can readily be adjusted to the position desired. This'is more particularly desirable in respect to the blades 0, as they are designed to first engage the broken vfuel as it comes from the. grinder B. Thesebl'ades arerset at an angle to feed the fuel forward and prevent any back'ward tendency of the material, while they also act to grind and comminute the same. The Walls of the conical portion of the casing act to retard the coarser particles in their passage through the pulverizer and hold them until reduced to the fineness desired. Some slight angular adjustment of the blades 0 may at times be desirable to cause them tofacilitateor retardthepassageof the fuel; but the adjustment of the blades 0" will ordinarily the result sought.

What I claim; and desire to secure by Let-.

ters-Patent, is-

1. In an apparatus for preparing and feeding fuel, a pulverizing-chamber of the form ofa truncatedcone, havinga cylindricalportion at its larger end the said cylindrical'por .i

be sufficient to accomplish larger end, of a series of revolving pulverizin g-blades within the said chamber, the blades within the-cylindrical portion being set at an angle to the axis of the chamber to feed ;the fuel forward and theother blades set at other and difierent angles, substantially as described. 4 V

In testimony whereof I affix my signature gin the presence of two Witnesses. ALBERT A. DAY.

Witnesses:

W; H'. PARRIS, WM. J; SMITH. v 

